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@uiten tatesatent ffirr.

JULES TUREL, 0Fv KENDALLVILLE, INDIANA.

Letters Patent INO. 77,781, dated May 1.2, 1868.

MODEv OF LBTTERING MARBLE.

To'A WHOM. 1T MAY concu-RN:

Be it known that I, JULES TUREL, of Kendallville, Noble county, State ofIndiana, have invented a certain new and useful Improvementin LetteringMarble; and I do hereby declaro the following to be a full, clear, andexact description thereof', reference being had to the accompanyingdran'ing,making part of this specification.

Figure lis a plan of a slab of marble and a plaster pattern, a portionof said pattern being removed to expose the letters in the marble.

Figure 2 1`s a section at a: fr, iig. vIl, representing a subsequentstage ofthe process,as hereinafter described.-

My invention consists in a mode of applying lead'or other metal toletters in marble or other stone, in order to add to their beauty anddurability. i In carrying o ut my invention, Iengrave the desiredletters in the stone to a moderate depth, but in this operation no greatcare or precision is required, except in the outlines of the letters. lInext coat the entire engraved surface with plumbago, pulverizedsoapstone, or other suitable powder.

I then apply along the central line ofthe letters a perpendicular stripof sheet iron or other metal, e, greased.

to prevent adherence, and then pour ou some cnlcined Ipla-ster of Parisin the formofal thin paste, so as'to' compiet-ely till the letters, andrise to some height above the surface of the marble, so as to givesuioient strength to the plaster cast A, which is thus formed. Thisstage ofthe operation is illustrated in iig. 1', where the plasy terpattern is represented in section.

When the plaster has become set and hard, I carefully`1emove it, cutaway' the 'projections from its face, and by following the lines of theimpressions of the letters, form corresponding cavities in its surfaceto the depth of about one-sixteenth of an inch'. -I then drill divergingholes b b to suche depth, (say, one-eighth of an inch,) and in suchpositions as may be necessary to secure and retain the metal whichissubsequentlypoured i-n to illlthe letters, as hereinafter explained.These holes' are represented in fig. 1, but in practice they will not,of course, be drilled until the plaster cast has been taken. v Theplaster is then replaced over the letters without the metal strip c.This stage of the operation is represented in iig. 2;

'The space left by the strip c constitutes a gate or sprue, g, extending'from entlto end of the line; andcon: necting the matrices formed by theengraved letters and the cavities in the plaster cast. The customaryfunnelshapc maybe imparted vto the sprue g, `either b v the form of thestrip c or by cutting'- away oneangle of the plaster. Before pouring thelead I prefer to`heat the marble, if practicable and convenient.` I thentake lead as pure and soft as possible, without angI alloy or chemicalpreparation, land having melted it, pour it into the letters from end toend, through the spi-ue g. The plaster pattern is Ithen removedalidthrown away. After this, with suitable instruments, I press and rub theprojecting portions of thev leadV as closely1 as possible into theletters,'and th'en cut away the superfluous parts down to the surface ofthe marble, or nearly so, and the entire surface is then rubbed downandpolshed in thesame manner as a piece of plain marble or other stone.

By the contact of the water and stone inpolishing, the surface of thelead acquires a softl black hue, which .increases with exposure to theWeather, and forms a very beautifulcontrast tothe marble, and, as thereare no February, A. D. 1868,1

projecting surfaces or salient angles or edges t suffer abrasion fromthe weather, or from violence` orlany cause, the Work will endure ingood condition as long as the stone itself'.

I have-described my invention as applied to marble, but it is manifestlyapplicable to any description of stone in which lettersmaybe cut.-

Having thus described my invention, nhat I claim as non', and desrctosecureby Letters Patent, is- The proc ess,substantially ashereindescribeil, -for applying metalliclettering to.` marble or otherstone.

To the above specification of my improvement in lettering marble, I havesignedmy hand, this 4th day of 'JULES TUREL. Witnesses:

THOMAS L. GRAVES, Ones. G. Alemana

